Wavelength range 205 to 770 mu

WITH RECORDER . . . double b e a m . . . a.c. operated . . . high resolution

A compact, direct reading, double beam/single beam instrument designed for ease of operation in rapid routine analysis in the range 205 to 770 ηΐμ— the least expensive and most versatile instrument now available in this range.

Provides excellent resolution in the ultraviolet— see Benzene Vapor curve at right—i.e., better than 0.5 ταμ in the ultraviolet and 1.5 ηΐμ in the visible.

Suitable for absorbance, t r ansmi t t ance , or differential ra t io recording, repet i t ive scanning, reaction r a t e studies, e tc . Completely a.c. line operated. Me te r reads directly in absorbance and percent t r ansmi t t ance . Wavelength dial has direct reading linear scale wi th range 200 to 800 ηιμ. Amplifier has plug-in circuit boards . 9098-K10. Spectrophotometer, Beckman Model DB, range 205 to 770 π\μ, with tungsten filament lamp, hydrogen discharge lamp, and wavelength drive unit for scanning speeds of 10 and 40 ηΐμ per minute. Without recorder or power supply for the hydrogen lamp. For 115 volts, 60 cycles, a.c 1,960.00 8591. Recorder, Beckman Potent iometr ic , for 5-inch strip charts. With convenient push-button controls. Full scale range adjustable continuously from 10 to 100 millivolts. Pen traverses full 5-inch chart width in 1 second. With single drive unit for chart speed of 1-inch per minute. For 115 volts, 60 cycles, a.c 500.00 9104-A5. Power Supply Unit, for operation of hydrogen discharge lamp; for 115 volts, 60 cycles, a.c 315.00

230 240 250 260

SEE OUR 7967 CATALOG for detailed description of Model DB and for 10-inch paper width Recorders to

permit measurement of linear absorbance

ARTHUR H. THOMAS COMPANY More and more laboratories rely on Thomas Laboratory Apparatus and Reagents

V I N E S T . A T 3 R D · P H I L A D E L P H I A S , P A .

Circle No. 97 an Readers' Service Card

1 1 0 A · ANALYTICAL CHEMISTRY

3 E C K M A N Mode l DB * * ^

SPECTROPHOTOMETER